© Fulton Group N.A., Inc. 2022
2-24
INSTALLATION EDR-SOLA-IOM-2022-0216 SECTION 2
! WARNING
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct, and strict
adherence to applicable jurisdictional/
professional codes and regulations.
4 CAUTION
Do not use insulation on polypropylene
materials. Use of insulation may elevate pipe
wall temperatures, resulting in the potential
for vent material failure.
L NOTE
Listing precludes direct vent witness test.
Combustion Air Supply From the Boiler Room
Adhere to the following for installation:
1. Adequate combustion air and ventilation must be supplied to the boiler
room in accordance with local codes and NFPA54/ANSI Z233.1, Section
9.3, Air for Combustion and Ventilation or CSA-B149.1 for Canada. The
minium net free area requirements in Table 6 may not supersede local and
jurisdictional codes and regulations where there codes and regulations
require an opening of greater net free area. The boiler room must meet the
NFPA criteria for a non-conned space. See Figure 23.
2. Verify combustion air is taken from the outdoors and not from the inhabited
or occupied spaces within the building. Ensure space and nearby products
are evaluated for the potential of combustion air contaminants. See Table 5.
3. For installations providing two permanent openings directly
communicating with the outdoors, the minimum net free area of each
opening is 1 in per 4,000 BTU/hr of the total input capacity of the
combined burners located in the boiler room. Ensure a high opening
commences within 12 inches of the ceiling, and a low opening commences
within 12 inches of the oor. See Table 6.
4. For installations providing a single permanent opening directly
communicating with the outdoors, the minimum net free area of the
opening is 1 in per 3,000 BTU/hr of the total input capacity of the
combined burners located in the boiler room. See Table 6.
5. For multiple boiler installations, multiply the number of boilers by required
net free area per boiler.
TABLE 6 MAKEUP AIR VENTILATION OPENINGS
Boiler Input
Capacity
(MBTU/HR)
Two Openings Min. Net
Free Area Each (SQFT )
Low High
Single Opening Only
Min. Net Free Area
(SQFT)
750 1.3 1.3 1.7
1000 1.8 1.8 2.3
1500 2.6 2.6 3.5
2000 3.5 3.5 4.6
6. The net free area required for the boiler(s) is in addition to the combustion
or ventilation air supply requirements of other equipment sharing the
same space such as water heaters, generators, air compressors, or other
boilers. The boiler room must have an opening or openings not less than
the total net free area required for all types of equipment.
7. Consider the blocking eects of louvers, grills, and screens on the net free
area of each opening. Ensure ventilation openings are unobstructed.
8. Ensure there is not negative pressure in the boiler room. The boiler room
pressure must be neutral relative to the outdoors.
9. Where mechanical combustion air supply systems are used, such as a
combustion air supply fan or a motorized louver, they must be interlocked
with the boiler control panel to prove operation prior to burner ignition
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